在木材横切面上，靠近髓心部分，一般木材颜色较深，水分较少的木材。由边材演化而成。
On the cross-section of the wood, near the core part, the wood generally has a darker color and less moisture. It evolves from the sapwood.

根部木材中形成的心材部分。
Heartwood formed in the woody tissue of roots.

树干木材中形成的心材部分。
Heartwood formed in the trunk wood.

积聚在心材内的树脂或树脂质渗出物。
Resin deposits or exudates accumulated within heartwood.